$OpenBSD: patch-sysdep_bsd_sysio_h,v 1.2 2017/04/18 09:31:59 sthen Exp $
--- sysdep/bsd/sysio.h.orig	Thu Dec 22 22:53:39 2016
+++ sysdep/bsd/sysio.h	Thu Mar  2 23:47:06 2017
@@ -198,7 +198,7 @@ sk_prepare_ip_header(sock *s, void *hdr, int dlen)
 #define TCP_SIG_SPI 0x1000
 #endif
 
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 #define USE_MD5SIG_SETKEY
 #include "lib/setkey.h"
 #endif
